Solicap M FTI55, FTI56
Installation
Hauser
23
Probe length and minimum coverage
!
Note!
• When selecting the probe length, pay attention to the dependency between the relative dielectric
constant
r
and the minimum amount the probe rod needs to be covered (see Table).
• For probe length tolerances see Page 19 ff.
• To ensure problem-free operation, it is important that the difference in capacitance between the
covered and uncovered parts of the probe is at least 5 pF.
• If you do not know the dielectric constant of the material, contact us for advice.
In this example, the grounded steel plate forms
the counter electrode.
Heat insulation prevents condensation and
therefore buildup on the steel plate.
TI418Fen09
In a silo with concrete walls
When installing in a silo made of plastic, a sheet
metal plate must be attached to the exterior of
the silo as a counter electrode.
This plate can be either square or round.
– Dimensions in the case of a thin silo wall
with a low dielectric constant:
approx. 0.5 m along each side or ø0.5 m;
– Dimensions in the case of a thicker silo wall
or wall with a higher dielectric constant:
approx. 0.7 m along each side or ø0.7 m.
TI418Fen10
In a silo with plastic walls
Sheet metal plate
with
threaded socket
Heat insulation
min.
ø300
or
300
Sheet metal plate
Ground connection
Electrical
HF field
Product properties,
relative dielectric constant
r
TI418F12
* Minimum coverage
Electrically conductive
25 mm
Nonconductive
r
> 10
100 mm
r
> 5 to 10
200 mm
r
> 2 to 5
500 mm
**
